The biggest problem is when two walls are cinder block and you get an imbalance. A three layer buildup on the wall with out the block and adding furring strips, insulation, and sheetrock on the block wall will help. If the block is behind the speakers it will help reinforce the bass--sometimes too much, but if you are planning to use the entire area as a listening room I don't expect that to be a big problem. You will have a domiminent bass peak based on the floor to ceiling height since that is by far the majority of the area of parallel surfaces (and the others are so far apart). Ceiling diffusion will be a big issue for this reason, very likely more so than the issues with the concrete block. Give us a call and we may have a few tips to help you out.
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